Still having this problem, would like to revisit it briefly, just to see if anyone else is having similar issue.

Running fail2ban-regex on the mail.log for both sasl.conf and postfix.conf return results, but there are zero ban/unbans in the fail2ban log and no errors either, it doesn't seem to be trying at all. Obviously the syntax of the regex is okay, as it gets results, so I'm not sure where in the process this is breaking down.

I'm using Ubuntu 12.04 and Fail2ban updated to 0.8.8, set fail2ban loglevel to 4 and don't see any reason for the failure.

Might anyone know why fail2ban registered absolutely nothing in its logs
during this ongoing login-per-second attempt, for hours on end, given
the output from fail2ban-regex, above?

Thanks for any pointers,

-Ben

Click to expand...

Upgrading to 0.8.8 solved the problem for me. It is entirely possible (and quite likely) that upgrading to 0.8.8 was somewhat of a "red herring". Perhaps the upgrade process simply reset something that was botched-up. Given that you are already on 0.8.8, I'm not sure what to tell you to try next. Have you gone to the fail2ban mailing list with this?

I experienced what may be the same issue (and it began happening all of a sudden).

Excerpted from the fail2ban mailing list:

Upgrading to 0.8.8 solved the problem for me. It is entirely possible (and quite likely) that upgrading to 0.8.8 was somewhat of a "red herring". Perhaps the upgrade process simply reset something that was botched-up. Given that you are already on 0.8.8, I'm not sure what to tell you to try next. Have you gone to the fail2ban mailing list with this?

Click to expand...

I haven't gone down the fail2ban mailing list route yet, wanted to see if anyone running more or less the same setup I am have experienced the same issue first.

Curious, what do you use for backend setting, it was set to 'auto' but I changed it to 'polling' and got no results

OK, well, it's "solved" now, CBJ, your post had me thinking that there must just be something amiss, so I did an apt-get purge on fail2ban, rebooted, reinstalled, and it worked. Seems weird, because I had done all of these process separately before, but doing that order seemed to get things up and running (using 0.8.8, not 0.8.6)